#include <stdio.h>
#include <stdlib.h>
int main(){
  int y, m;
  int d;
  scanf("%d%d", &y, &m);
  switch (m){
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
      d = 31;
      break;
    case 4:
    case 6:
    case 9:
    case 11:
      d = 30;
      break;
    case 2:
      if ((y % 4 == 0 && y % 100 != 0) || y % 400 != 0)
        d = 29;
      else
        d = 28;
      break;
    default:
      d =  - 1;
      break;
  }
  return EXIT_SUCCESS;
}
